IMNSHO if calibre were in C/C++ it would be about 1/10th as capable as it is now, it would develop at 1/10 the speed and most probably I would have moved on to doing other things by now.
That said, if you want to improve the speed of calibre, do some profiling, find the bottlenecks. Once you do, it is always possible to write C extensions to speed them up.
calibre currently has about half a dozen extensions written in C to speed up certain operations.
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